Similar problem. My printer is attached to the Ubuntu PC but after the upgrade, it is no longer visible to the Windows box. I tried browsing the network and I too get unable to access location.
Perhaps the upgrade removed Samba? How does one find out what is installed? Since Unity arrived, I find that these sort of things have become hidden and I don't even know how to check what is installed any more.
Unable to access Location
Failed to retrieve share list from server. No such File or directory.